bigener vs crossbreed

bigener

crossbreed

noun
  • An organism produced by mating of individuals of different varieties or breeds. 

verb
  • To mate so as to produce a hybrid; interbreed. 

  • To mate (an organism) with another organism so as to produce a hybrid. 

  • To produce (an organism) by the mating of individuals of different breeds, varieties, or species; hybridize. 

How often have the words bigener and crossbreed occurred in a corpus of books? (source: Google Ngram Viewer )